Answer:
The new girl was LIKEABLE.
the food on the table was DESIRABLE.
he had made himself RELIABLE over the years.
the giant graffati was somehow the opposite of NOTICEABLE.
the face mask was DISPOSABLE.
Explanation: an "able" suffix word just has able at the end. (the capatalized word is the "able" suffix.
It's generally said that he wrote 37 plays, but no-one actually knows.
It's B. The dashes separate a mild afterthought.
A relative pronoun usually introduces an adjective clause